165297 2016-12-02 01:40:08 -0800 PNG textures with zero alpha channel have wrong rgb colors when reading them in a shader 2021-08-04 01:02:47 -0700 1 1 1 Unclassified WebKit WebGL Safari 10 iPhone / iPad iOS 10 NEW InRadar P2 Normal --- 1 nederland074 webkit-unassigned alex dino eric.carlson felixmariotto gman jonlee justin_fan mail michael.herzog sfranci supermoos webkit-bug-importer oldest_to_newest 1255639 0 295932 nederland074 2016-12-02 01:40:08 -0800 Created attachment 295932 Test archive (HTML + PNGs) When reading a texture created from a PNG image in a shader (via the texture2D() call) the rgb color depends on the alpha value. If the alpha is zero, when the rgb color is completely black regardless of what's actually stored in texture channels. If the alpha is non-zero (even if it's 1/255) the rgb color is correct. This behavior makes it more difficult to use a texture as a storage for independent data in a form of packed together rgba channels. This issue doesn't occur for a similar texture, that's created from a uint8array array buffer, so it's probably related to PNG images. Also, this issue doesn't occur in Safari/Chrome/Firefox under macOS 10.10.3. In the attachment there is the example that demonstrates rendering the RGB color from a red texture which alpha channel filled with 1/255 value (working_image.png) and with zero value (not_working_image.png). Both should be red, but the latter is black on iPad. 1259276 1 dino 2016-12-12 16:59:10 -0800 <rdar://problem/29630830> 1523123 2 gman 2019-04-01 16:22:58 -0700 2 years and this bug is still not fixed? iOS safari does not pass the conformance tests https://www.khronos.org/registry/webgl/sdk/tests/conformance/textures/misc/gl-teximage.html?webglVersion=1&quiet=0&quick=1 1523246 3 michael.herzog 2019-04-02 01:32:43 -0700 This issue was also reported at the three.js forum (https://discourse.threejs.org/t/texture-rgb-values-are-zero-when-alpha-is-zero-on-ios/6840). We've added a fiddle that should work as an additional test case. Normally, the entire plane should be red. On iOS Safari and Chrome, the bottom left part of the plane is black. https://jsfiddle.net/vyzc2sgj/1/ 1781844 4 felixmariotto 2021-08-04 01:02:47 -0700 5 years later, this issue is still not fixed. 295932 2016-12-02 01:40:08 -0800 2016-12-02 01:40:08 -0800 Test archive (HTML + PNGs) test.tar application/x-tar 10240 nederland074 dGVzdC8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADAwMDA3NzUAMDAwMTc1 MAAwMDAxNzUwADAwMDAwMDAwMDAwADEzMDIwMjMzMDI3ADAxMDUwMwAgNQAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB1c3RhciAgAGl2YW4AAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAaXZhbgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 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